Implement for slitting the envelop of twin insulated wires.



w. J. & T. P. COURTNEY. IMPLEMENT FOR SLITTING THE BNVELOP 0F TWININSULATED WIRES.

APPLICATION FILED JULY 31. 1908.

Patented Apr. 20, 1909.

UNITED sTATns rA EnT emen.

WILLIAM J. COURTNEY AND THOMAS F. COURTNEY, OF :CHIGAGO, ILLINOIS.

IMPLEMENT FOR "SLITTING THE ENVELOP OF INSULATED WIRES.

To all whom it may concern:

Be it known that .We, WILLIAM J. COURT- NE)? and THOMAS F. COURTNEY,vcitizens of the United States, residing at Chicago,

county of Cook, and State of Illinois, have. invented certain new anduseful Improve a quick and easy method of slitting the outer envelop orinsulating coating of twin insulated wlres priorto removing the same.

A further object of our,invention is to'provide an implement of acharacter. as mentioned, which may be made to form an attachment forpliers of suitable design already in use, or which may be manufacturedsimultaneously With pliers especially designedto accommodate the same.

A st1ll further object of our invention is to rovide an im lement whichwill be of the 'glhest possib e efficiency, and one-which wi be strong,durable, simple of. construction, hence, of low cost to manufacture.Other objects will appear hereinafter. With these objects 1n view, ourinvention consists generally in a pair of liers of novel construction,the upper jaw o the same bemember, said blade belng adapted when twinwires are properly positioned upon said backing member and the pliersdrawn parallel with said wires, the jaws of the same being closed, topierce and slit the insulating envelop ofsaid wires so that it may bereadily removed by the fingers.

Our invention further consists in certain details of constructionandarrangements of parts all as will be hereinafter fully described andparticularly pointed out the claims.

Our invention will be more readily under Specification of LettersPatent.

Application filed. July 31,

Patented April 20, 1909.

190,8. Serial No. 446,217.

stood by reference to the accom ,anying drawings forming a part of thisspeci cation, and in which,

Figure 1 is a perspective view of the preferred form of our device, Fig.2 is a side elevation thereof, and Fig. 3 is a vertical transversesection of the same taken on the line mas of Fig. 2.

- Referring now to the drawings, 1 and 2 indicate the upper and lowerjaws, respectively, of a pair of pliers which may be of any ordinary orpreferred form, and 3 and 3 the respective handle ortions thereof, "4indicating the pin by which said jaws are hinged together. Suitablysecured as by soldering or by screws, the latter being used in theattachment form of our device, to one side of the jaw 1 and laterallyextending therefrom, is a channelshaped member '5, the channel 6 formedby the depending ears 7 of said member 5 bein lon 'tudinally extending,that is, paralle Wit the sides of saidjaws. Detachably se cured as by ascrew 8, so as to facilitate sharpening or renewing of the same, to saidmember 5, the same preferably resting in a recess 9 provided for therece )tion thereof, is the shank 10 of a downwar ly extending,preferably tool steel, blade 11. Said blade shank 10 is so ositionedupon said member 5 that the bla e-edge 12 of the de ending blade 11thereof extends substantia ly centrally and vertically in said channel 6for reasons hereinafter stated. Suitably secured as by soldering or byscrews, the latter being preferably used in the attachment form of ourdevice, to the side of the jaw 3 and laterally extending therefrom, thesame being positioned directly below the member 5 and blade 11, is anangular member 13, the horizontally extending portion 14 of said member13 being adapted to act as a backing or support for wires durin theprocess of removing the envelop of t e same.

In using the device, the jaws of the phers are first opened, the twinwires to be separated being placed upon the suppert or backing 14;whereupon the jaws are closed. It is i'ngl positioned centrally in thechannel 6, wi pierce the envelop of the twin wire necessarily restingbetween the wire members of said twin wire. By drawing the pliersbackwardly to the end of thewire, one sideof the obvious that as theplier jaws are closed as mentioned, the blade 11 by reasbn of itsbeenvelop will be slit, as clearly shown in Fig. 1

'of the accorn an in drawings and bv re b v a, 7 .1

versing the Wire the opposite side of the envelop of the same may alsobe slit, whereupon said envelop may readily be removed by the fingers.By the provision of the device as just described in a pair of pliers, itwill obviously facilitate means for easily, quickly and eliicientlyremoving an insulating envelop or other coating of twin wires withoutdanger of disturbing the insulating coverin of the se arate twin wiremembers, and Wil obviate t e usual method of se )flrating wires which isgenerally done with a knife blade or other like tool, in which case theinsulation of the separate wires is almost invariably cut and bruised,making it neces sary to su ply other insulation'for the same, thus resuting in a waste of time and labor, hence a financial loss.

In our preferred form of pliers, for the purpose of severing or actuallycutting the wire, we provide'each of the jaws of said pliers with acutting or knife-edge 15, the latter constituting a wire clipper, andrecess each jaw beyond said knife-edge as at 16 for obvious reasons.Said clipper is not an important feature in our invention however, butWe show the same in order to illustrate a handy tool of which ourinvention is the central and main part.

Having described our invention what we claim as new, and desire tosecure by Letters Patent, 1s:

1. An implement of the character (lo-- 2. An implement ol' the charaeterde-i scribed comprising two members hinged together, a supporting plateprojecting to one side of one of said members, a channelshaped guideprojecting to the same side of the other member and located above theplate, and having a recess in its outer face, a blade shank secured inthe r cess of the guide, and a blade on said shank leated at the centerof the guide and projecting down beside the same.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses. WILLIAM J. COURTNEY. THOMASP. OUR'INEY.

Witnesses:

JANET E. HOGAN, HELEN F. LILLIs.

